Nations Back International Monetary Fund Bailout to Avert Collapse of Ukraine Economy

WASHINGTON—Finance leaders from the world's 20 largest economies Friday expressed worries that Ukraine's crisis may fuel global economic instability, raising concerns about potential fallout from a major escalation in the sanctions battle between Russia and the West.

"We are monitoring the economic situation in Ukraine, mindful of any risks to economic and financial stability," the G-20 said in its official communiqué after...